这意味着加速度与位矢平行。

So, that means the acceleration is parallel to the position.

youdao

一边是位矢。

R One is the position vector, r.

youdao

那么如果过一段时间，这就有一个向量△,它是位矢经过一段时间的改变量。

r So, if we wait a certain amount of time, we'll have a vector, delta r, which is the change in position vector a various interval of time.

youdao

You can actually take derivatives of a vector with time.

你可以直接求位矢对时间的导数

耶鲁公开课 - 基础物理课程节选

More position vectors? I want to look at that.

例如其它的位矢,我想来看一下

耶鲁公开课 - 基础物理课程节选

That's the analog of the position vector.

那是和位矢相似的情况

耶鲁公开课 - 基础物理课程节选